Every video of yours I get into I find myself cursing the TH-cam algo for preventing me from finding this channel years ago. Your stuff is great and I’m learning a ton. Thank you!
I'm unlikely to build something like this but enjoyed the learning curve. Especially the differences in AM and SSB amplification and their requirements. The efficiency characteristics were an eye opener too. Looking forward to part two. Thanks for doing this Mike.
Thank you very much for this video. I've been trying to teach myself about tubes and biasing networks etc. I find there's not enough of these kind of videos on TH-cam for people interested in two amplifiers. I would love to build myself a high-powered all mode tube amplifier someday like possibly an 8:11. But I am going to start small and keep it simple at first until I understand more about the subject. Thanks again and best 73s
I would think optimizing a linear amplifier just for SSB would be more of a hassle than optimizing an AM linear amp. to work on both AM and SSB? I had a KLV-1000 Italian-made HD 1000-watt linear for 10 meters converted for 11 meters. I cannot remember the IDs of the 4 tube final output tubes. My 2990 was the driver in this case. It was good for about 800-900 watts on AM and SSB. Back then the neighbors were not happy with my setup interfering with their TVS and telephones so I got rid of the Linear. It only cost my $550 brand new.. I was walking over locals in California from Vermont..
That great. I use AL572 amp with 572/B tubes. with amps like mine or 811A type running AM is hard on them. reduce drive to save tubes. MY AL572 has a special bias when running SSB between words the bias cuts down saving heat. for FM and CW you can bias class C . also large AM transmitters are using AMC modulation big saving's on input power. and the station I worked at can go 120% mod. on AMC . Funny I just ordered some 6164B Russian tubes. I have China and GE 6146W tubes now. I made AM transmitters. I used cathode modulation. with 6164B , 73's
For what it's worth, The question brought up by folks as why you didn't use a SS linear because it's simpler, both of the amps look about the same to me with regard to skill. I'm glad you're using a tube. 😉 👍
With SSB linear amplification I always try to use a lower output power than if I was to use it on AM. Also on SSB I use the lowest dead-key carrier which would be on AM to TX with. I always try to have the modulation swing as much as possible on SSB. Instead of the wattage output meter showing little swing.. On AM I don't worry so much about swing instead of carrier. Also as we know using a linear on SSB you have to have a delay set up on your relay. Otherwise, you get chatter if there is no delay implemented.. I've noticed on SSB anything over 80 watts on an amateur 10-meter radio sounds like garbage.. I have an RCI 2990 that PEPs at 90 watts on AM, FM, and SSB.. I have not tested CW yet.. I use an Omni-direction Solarcon A-99 with a 102" steel whip in place of the top element. I also have the ground plane kit attached to the base of the antenna. Just the other night I had a QSO with Oregon, California, and Alberta. I live in Vermont. I was outputting about 20 watts PEP on LSB.. 27.3750 it was 7:30 pm in Vermont..
Some tubes (many peanut tubes) have the suppressor grid brought out separate from the cathode. Super easy to modulate with some negative V and an electret mic into a step up audio transformer. I used a carbon mic just to match the project as it was written in 101 Easy Ham Radio Projects. The vids before go through the little TX.
I suspect there were mobile transceivers that used 12V vacuum tubes with a 12V B+ i.e the tubes that were developed in 1957 when the transistors of the day were not ready for prime time.
Yes all of the two-way radios used tube drivers and finals late in the semiconductor era; development continued well into the 60's. The 12V versions of the 6146 are many.. 6883, 8552, 8032 etc.. The Compactrons and other really high performance tubes like the Motrac Finals were manufactured up until the 70s.
Mike, I too had problems getting 'purported' power out of the 5763s. Even in class-C, I've heard stories of north of 10-12 watts! I finally ran across some Tungsol data that showed useful power at class-C to be 6.4 watts; which is more in line with what I've seen Also Mike, did you consider the 2E26, I would think that it would fit perfectly in what you are doing and be loafing at it (?). Finally, I have some (REALLY) bizarre dual VHF/UHF tubes that would probably be cute as CW transmitters! 73...
It is always better (6146 circuit) better to derive the screen supply from the plate supply to avoid losing the plate supply while maintaining screen Voltage. (which would burnout the screen wires) The 807 and 826 tubes (used in class "B push pull) are zero bias minimal plate current and distortion for linear amplification. Ron W4BIN
Can't wait for part 2. Don't use up all the 6cl6s and 6146 tubes, I have a couple HW-101s left to rebuild. Where did you get the shirt btw? I just put that sticker on my toolbox. Also I fully support your decision to not build with cold heartless solid state.
There's a few folks running 50-100kw AM on 11M so I see what you're saying about 100w is enough -- Average person can't afford to go higher (price and legality).
Every video of yours I get into I find myself cursing the TH-cam algo for preventing me from finding this channel years ago. Your stuff is great and I’m learning a ton. Thank you!
I'm unlikely to build something like this but enjoyed the learning curve. Especially the differences in AM and SSB amplification and their requirements. The efficiency characteristics were an eye opener too. Looking forward to part two. Thanks for doing this Mike.
Love the shirt! Great series also.
Thank you very much for this video. I've been trying to teach myself about tubes and biasing networks etc. I find there's not enough of these kind of videos on TH-cam for people interested in two amplifiers. I would love to build myself a high-powered all mode tube amplifier someday like possibly an 8:11. But I am going to start small and keep it simple at first until I understand more about the subject. Thanks again and best 73s
I find this very informative. Looking forward to the modifications that you would have to make to a SSB amplifier, to accommodate AM mode. Thank you!
Awsome Video - great job. I really enjoyed watching this. Happy weekend & 73 de Uncle Guenter from southwest Germany 💯👍🙋♂
I love your t-shirt. I must hunt one down for myself.
Great videos. I share your interests and much of your equipment. Always interesting!
I would think optimizing a linear amplifier just for SSB would be more of a hassle than optimizing an AM linear amp. to work on both AM and SSB? I had a KLV-1000 Italian-made HD 1000-watt linear for 10 meters converted for 11 meters. I cannot remember the IDs of the 4 tube final output tubes. My 2990 was the driver in this case. It was good for about 800-900 watts on AM and SSB. Back then the neighbors were not happy with my setup interfering with their TVS and telephones so I got rid of the Linear. It only cost my $550 brand new.. I was walking over locals in California from Vermont..
That great. I use AL572 amp with 572/B tubes. with amps like mine or 811A type running AM is hard on them. reduce drive to save tubes. MY AL572 has a special bias when running SSB between words the bias cuts down saving heat. for FM and CW you can bias class C . also large AM transmitters are using AMC modulation big saving's on input power. and the station I worked at can go 120% mod. on AMC . Funny I just ordered some 6164B Russian tubes. I have China and GE 6146W tubes now. I made AM transmitters. I used cathode modulation. with 6164B , 73's
For what it's worth, The question brought up by folks as why you didn't use a SS linear because it's simpler, both of the amps look about the same to me with regard to skill. I'm glad you're using a tube. 😉 👍
SS? Social Security?
@@Capecodham Yes You need SS. Solid State
I really need to get a shirt like that! It's one of the greatest things I have ever seen!
He does a great video, schematic inserts, detailed explanations and all you can comment on is his shirt.
With SSB linear amplification I always try to use a lower output power than if I was to use it on AM. Also on SSB I use the lowest dead-key carrier which would be on AM to TX with. I always try to have the modulation swing as much as possible on SSB. Instead of the wattage output meter showing little swing.. On AM I don't worry so much about swing instead of carrier. Also as we know using a linear on SSB you have to have a delay set up on your relay. Otherwise, you get chatter if there is no delay implemented.. I've noticed on SSB anything over 80 watts on an amateur 10-meter radio sounds like garbage.. I have an RCI 2990 that PEPs at 90 watts on AM, FM, and SSB.. I have not tested CW yet.. I use an Omni-direction Solarcon A-99 with a 102" steel whip in place of the top element. I also have the ground plane kit attached to the base of the antenna. Just the other night I had a QSO with Oregon, California, and Alberta. I live in Vermont. I was outputting about 20 watts PEP on LSB.. 27.3750 it was 7:30 pm in Vermont..
The remark about bias to the grounded grid tubes, since that is AB isn’t the top of the signal being output to the tank circuit and being recreated?
What is the radio you are using? it’s a great looking radio.
DX Bow, NH. Impressive. 12 Miles.
You are so much smarter than me.
I promised DX!
Using suppressor grid? Cool.
Years (decades) since I've messed with tubes.
Some tubes (many peanut tubes) have the suppressor grid brought out separate from the cathode. Super easy to modulate with some negative V and an electret mic into a step up audio transformer. I used a carbon mic just to match the project as it was written in 101 Easy Ham Radio Projects. The vids before go through the little TX.
I suspect there were mobile transceivers that used 12V vacuum tubes with a 12V B+ i.e the tubes that were developed in 1957 when the transistors of the day were not ready for prime time.
Yes all of the two-way radios used tube drivers and finals late in the semiconductor era; development continued well into the 60's. The 12V versions of the 6146 are many.. 6883, 8552, 8032 etc.. The Compactrons and other really high performance tubes like the Motrac Finals were manufactured up until the 70s.
Mike, I too had problems getting 'purported' power out of the 5763s. Even in class-C, I've heard stories of north of 10-12 watts! I finally ran across some Tungsol data that showed useful power at class-C to be 6.4 watts; which is more in line with what I've seen
Also Mike, did you consider the 2E26, I would think that it would fit perfectly in what you are doing and be loafing at it (?).
Finally, I have some (REALLY) bizarre dual VHF/UHF tubes that would probably be cute as CW transmitters! 73...
Charles Caringella's book Amateur Radio Construction Projects features a 5763/2E26 Transmitter that is hard to beat.
It is always better (6146 circuit) better to derive the screen supply from the plate supply to avoid losing the plate supply while maintaining screen Voltage. (which would burnout the screen wires) The 807 and 826 tubes (used in class "B push pull) are zero bias minimal plate current and distortion for linear amplification. Ron W4BIN
where can I find these old tubes. any addresses?
Nice
Can't wait for part 2. Don't use up all the 6cl6s and 6146 tubes, I have a couple HW-101s left to rebuild. Where did you get the shirt btw? I just put that sticker on my toolbox. Also I fully support your decision to not build with cold heartless solid state.
Lastly, I'll never get my HAM license I'm completely satisfied with 27-Mhz.. Oh my KLV-1000 HD had 4 EL-509 tubes..
👍Good! 🙋73!
great compliment.... ik7izm
There's a few folks running 50-100kw AM on 11M so I see what you're saying about 100w is enough -- Average person can't afford to go higher (price and legality).
Awesome work! de KK4LGL